In Open3D, how do you make the faces of the grid double-side show

Rendering
#1

I am new about open3d. In Open3D, how do you make the faces of the grid double-side show.
The following two figures are what I showed using Open3D，but its grid surface is single-sided.I want the grid surface to be double-sided, such as the following two images (which I have shown with other software)

single-double side
single-double side1096×640 875 KB

Any reply will be appreciated! Thank you!

#2

I got it finally, I can set the param ‘mesh_show_back_face=True’ in o3d.visualization.draw_geometries. But I sad about this forum for I have my issue stay four days, however, no one see it. It seems there is few people and it make me believe this forum was deactive.